I am sure DigitalOcean has recieved many requests to support various cryptocurrencies. And while that is nice, what DigitalOcean should really be doing is reevaluating their system and start embracing real time finance as advocated by Sablier.
Using Sablier's money streams, DigitalOcean would enable users to still pay by the hour, but users would not have to pay upfornt for loading their accounts with Credits that may end siting around not being used. Nor would DigitalOcean have to wait 29 or 30 days to bill users as Sablier's real-time finance would enable payment to be streamed by the second.
Sablier GitHub -the protocols are all open source: https://github.com/sablierhq
Sablier Docs: http://docs.sablier.finance/
Sablier on Discord: https://discord.gg/jGbwrb
As for cryptocurrencies, just use Stable coins like Synthetic USD -or other Synthetic Fiat Tokens- or DAI.